Partyline: Describe the AB-120 internal dipswitches and jumpers
DESCRIPTION OF INTERNAL JUMPER OPTIONS AND ADJUSTMENTS
The AB-120 has internal jumper options, connector selectable microphone output levels, dip switch selection of ear phone output, and headphone sidetone adjustment controls. As shipped from the factory, the AB-120 has its internal jumpers anddip switches set to implement the Clear-Com party-line as described in its respective section. The unit is setup for sportscaster mode, option and the mic output level is set for -10 dBu. The unit will operate on power from the intercom line or from the external DC supply. All of these jumpers and settings may need to be set depending on the application of the unit.
To gain access to the internal options, remove the bottom cover by unscrewing the four rubber feet. There is a diagram showing the switch settings and jumper options attached to the inside of the bottom cover.SEE ATTACHED .JPEG
Jumper OptionsThere are eleven two position jumpers that provide many options for the operation of the AB-120. To access these jumpers, remove the bottom cover of the unit. Inside the bottom cover is a label describing the functions of jumper and switch.Note: Jumpers 2, 3, 4 and 6 are not used.
JP1JP1 provides termination for the intercom line if needed. The AB-120 is always a remote intercom station and therefore does not provide termination for an intercom line. The termination is provided for the cases where the party-line output of the AB-120 is not used and the party-line drive circuit needs termination to be stable and not oscillate. As shipped from the factory, the jumper is between pins 1 and 2 of JP1 making the termination inactive. To activate termination, place the jumper between pins 2 and 3.
JP7JP7 allows the send gain on the talkback channel to be increased when driving a TW type intercom line, such as RTS. Placing the jumper between pins 2 and 3 increases the send gain approximately 4 dB. JP7 is shipped from the factory with its jumper between pins 1 and 2, providing Clear-Com standard levels to the intercom line.
JP8JP8 provides the selection of desired output level for the microphone output.
JP9 and JP10These JPs provide selection of the desired output level for the microphone output.
JP11JP11 selects the sportscaster or announcer modes of operation for the front panel push button switches. Connection between pins 1 and 2 enables the sportscaster mode and connection between 2 and 3 enables announcer mode.
Microphone Output PadThe microphone output connector on the rear panel can be internally plugged into two different headers on the main PCB. Connecting the output to J2 provides a high level of output. Connecting the output to J3 adds a 30 dB pad in the series to provide a lower level output.
Dip Switch Selection of Earphone OutputEach earphone amplifier has an eight position dip switch providing a selection of inputs to that amplifier. S2 is for the left ear and S3 is for the right. Any or all of the inputs can be selected at the same time. The following illustrates the function of each dip switch. Figure 1-6 (attached): DIP Switch Settings for S2 and S3 It will be noted that each of the IFB inputs has two dip switches and each has different gains associated with it. Dip switch 4 is for a 0 dB input on the IFB channel. Dip switch 3 is for a lower level on the same IFB input. If the IFB source is a balanced input or from a TW type system, then the 0 dB setting should be used. If the IFB source is from a Clear-Com Party-Line system, then the -15 dB setting is used.
Headphone Sidetone AdjustmentIf either talkback channel is selected for listening in the headphone, adjust R41 on the main PCB for the desired amount of talkback that is to be heard in the earphone.
The AB-120 has internal jumper options, connector selectable microphone output levels, dip switch selection of ear phone output, and headphone sidetone adjustment controls. As shipped from the factory, the AB-120 has its internal jumpers anddip switches set to implement the Clear-Com party-line as described in its respective section. The unit is setup for sportscaster mode, option and the mic output level is set for -10 dBu. The unit will operate on power from the intercom line or from the external DC supply. All of these jumpers and settings may need to be set depending on the application of the unit.
To gain access to the internal options, remove the bottom cover by unscrewing the four rubber feet. There is a diagram showing the switch settings and jumper options attached to the inside of the bottom cover.SEE ATTACHED .JPEG
Jumper OptionsThere are eleven two position jumpers that provide many options for the operation of the AB-120. To access these jumpers, remove the bottom cover of the unit. Inside the bottom cover is a label describing the functions of jumper and switch.Note: Jumpers 2, 3, 4 and 6 are not used.
JP1JP1 provides termination for the intercom line if needed. The AB-120 is always a remote intercom station and therefore does not provide termination for an intercom line. The termination is provided for the cases where the party-line output of the AB-120 is not used and the party-line drive circuit needs termination to be stable and not oscillate. As shipped from the factory, the jumper is between pins 1 and 2 of JP1 making the termination inactive. To activate termination, place the jumper between pins 2 and 3.
JP7JP7 allows the send gain on the talkback channel to be increased when driving a TW type intercom line, such as RTS. Placing the jumper between pins 2 and 3 increases the send gain approximately 4 dB. JP7 is shipped from the factory with its jumper between pins 1 and 2, providing Clear-Com standard levels to the intercom line.
JP8JP8 provides the selection of desired output level for the microphone output.
JP9 and JP10These JPs provide selection of the desired output level for the microphone output.
JP11JP11 selects the sportscaster or announcer modes of operation for the front panel push button switches. Connection between pins 1 and 2 enables the sportscaster mode and connection between 2 and 3 enables announcer mode.
Microphone Output PadThe microphone output connector on the rear panel can be internally plugged into two different headers on the main PCB. Connecting the output to J2 provides a high level of output. Connecting the output to J3 adds a 30 dB pad in the series to provide a lower level output.
Dip Switch Selection of Earphone OutputEach earphone amplifier has an eight position dip switch providing a selection of inputs to that amplifier. S2 is for the left ear and S3 is for the right. Any or all of the inputs can be selected at the same time. The following illustrates the function of each dip switch. Figure 1-6 (attached): DIP Switch Settings for S2 and S3 It will be noted that each of the IFB inputs has two dip switches and each has different gains associated with it. Dip switch 4 is for a 0 dB input on the IFB channel. Dip switch 3 is for a lower level on the same IFB input. If the IFB source is a balanced input or from a TW type system, then the 0 dB setting should be used. If the IFB source is from a Clear-Com Party-Line system, then the -15 dB setting is used.
Headphone Sidetone AdjustmentIf either talkback channel is selected for listening in the headphone, adjust R41 on the main PCB for the desired amount of talkback that is to be heard in the earphone.
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